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Ionospheric tilt angle as indicator of Travelling Ionospheric Disturbances
Vadym Paznukhov - Institute for Scientific Research, Boston College; David Altadill - Observatori de l'Ebre, Spain; José Miguel Juan - Research Group of Astronomy and Geomatics, Universitat Politècnica de Catalunya, Spain; Estefania Blanch - Observatori de l'Ebre, Spain
Ionospheric tilt is a concept used to characterize local horizontal electron density gradients in the ionosphere. Digisonde systems allow measuring angles of arrival of ionospherically reflected radio signals, from which the ionospheric tilts are derived. Here, we present the results from the analysis of the tilt measurements collected in 2012–2014 with a digisonde at Ebro Observatory (40.8°N, 0.5°E). A climatological distribution of wavelike variations in the tilt records presumed to be associated with traveling ionospheric disturbances (TIDs) with periods of 30 min to 1.5 hr which is rather typical for medium‐scale TIDs. There is a good agreement between the presence of TIDs and sporadic E layer occurrence, suggesting that some TIDs can be driven by instability in the electric field which is initiated via an interhemispheric link between the E and F regions of the ionosphere. Direction of disturbance propagation is also analyzed and compared to the modeled neutral wind. There are indications that during the daytime TIDs tend to propagate in the direction opposite to the background neutral wind. This suggests that daytime TIDs are produced by atmospheric gravity waves originating in the lower atmosphere and experiencing background wind filtering effect on their upward propagation.
16 July 2020
Abstract submission opens:
16 July 2020
European Space Weather Medals:
6 September 2020
25 September 2020
Registration deadline: [extended]
10 October 2020
Abstract submission deadline:
4 September 2020